292 lines
7.7 KiB
C
292 lines
7.7 KiB
C
/* Driver for DS3231 high precision RTC module
|
|
*
|
|
* Part of esp-open-rtos
|
|
* Copyright (C) 2015 Richard A Burton <richardaburton@gmail.com>
|
|
* Copyright (C) 2016 Bhuvanchandra DV <bhuvanchandra.dv@gmail.com>
|
|
* MIT Licensed as described in the file LICENSE
|
|
*/
|
|
|
|
#include "ds3231.h"
|
|
#include "espressif/esp_common.h"
|
|
#include "espressif/sdk_private.h"
|
|
#include "esp8266.h"
|
|
|
|
#include "i2c/i2c.h"
|
|
|
|
/* Convert normal decimal to binary coded decimal */
|
|
static inline uint8_t decToBcd(uint8_t dec)
|
|
{
|
|
return (dec / 10) * 16 + dec % 10;
|
|
}
|
|
|
|
/* Convert binary coded decimal to normal decimal */
|
|
static inline uint8_t bcdToDec(uint8_t bcd)
|
|
{
|
|
return (bcd / 16) * 10 + bcd % 16;
|
|
}
|
|
|
|
/* Send a number of bytes to the rtc over i2c
|
|
* returns true to indicate success
|
|
*/
|
|
static inline int ds3231_send(uint8_t reg, uint8_t *data, uint8_t len)
|
|
{
|
|
return i2c_slave_write(DS3231_ADDR, ®, data, len);
|
|
}
|
|
|
|
/* Read a number of bytes from the rtc over i2c
|
|
* returns true to indicate success
|
|
*/
|
|
static inline int ds3231_recv(uint8_t reg, uint8_t *data, uint8_t len)
|
|
{
|
|
return i2c_slave_read(DS3231_ADDR, ®, data, len);
|
|
}
|
|
|
|
int ds3231_setTime(struct tm *time)
|
|
{
|
|
uint8_t data[7];
|
|
|
|
/* time/date data */
|
|
data[0] = decToBcd(time->tm_sec);
|
|
data[1] = decToBcd(time->tm_min);
|
|
data[2] = decToBcd(time->tm_hour);
|
|
/* The week data must be in the range 1 to 7, and to keep the start on the
|
|
* same day as for tm_wday have it start at 1 on Sunday. */
|
|
data[3] = decToBcd(time->tm_wday + 1);
|
|
data[4] = decToBcd(time->tm_mday);
|
|
data[5] = decToBcd(time->tm_mon + 1);
|
|
data[6] = decToBcd(time->tm_year - 100);
|
|
|
|
return ds3231_send(DS3231_ADDR_TIME, data, 7);
|
|
}
|
|
|
|
int ds3231_setAlarm(uint8_t alarms, struct tm *time1, uint8_t option1, struct tm *time2, uint8_t option2)
|
|
{
|
|
int i = 0;
|
|
uint8_t data[7];
|
|
|
|
/* alarm 1 data */
|
|
if (alarms != DS3231_ALARM_2)
|
|
{
|
|
data[i++] = (option1 >= DS3231_ALARM1_MATCH_SEC ? decToBcd(time1->tm_sec) : DS3231_ALARM_NOTSET);
|
|
data[i++] = (option1 >= DS3231_ALARM1_MATCH_SECMIN ? decToBcd(time1->tm_min) : DS3231_ALARM_NOTSET);
|
|
data[i++] = (option1 >= DS3231_ALARM1_MATCH_SECMINHOUR ? decToBcd(time1->tm_hour) : DS3231_ALARM_NOTSET);
|
|
data[i++] = (option1 == DS3231_ALARM1_MATCH_SECMINHOURDAY ? (decToBcd(time1->tm_wday + 1) & DS3231_ALARM_WDAY) :
|
|
(option1 == DS3231_ALARM1_MATCH_SECMINHOURDATE ? decToBcd(time1->tm_mday) : DS3231_ALARM_NOTSET));
|
|
}
|
|
|
|
/* alarm 2 data */
|
|
if (alarms != DS3231_ALARM_1)
|
|
{
|
|
data[i++] = (option2 >= DS3231_ALARM2_MATCH_MIN ? decToBcd(time2->tm_min) : DS3231_ALARM_NOTSET);
|
|
data[i++] = (option2 >= DS3231_ALARM2_MATCH_MINHOUR ? decToBcd(time2->tm_hour) : DS3231_ALARM_NOTSET);
|
|
data[i++] = (option2 == DS3231_ALARM2_MATCH_MINHOURDAY ? (decToBcd(time2->tm_wday + 1) & DS3231_ALARM_WDAY) :
|
|
(option2 == DS3231_ALARM2_MATCH_MINHOURDATE ? decToBcd(time2->tm_mday) : DS3231_ALARM_NOTSET));
|
|
}
|
|
|
|
return ds3231_send((alarms == DS3231_ALARM_2 ? DS3231_ADDR_ALARM2 : DS3231_ADDR_ALARM1), data, i);
|
|
}
|
|
|
|
/* Get a byte containing just the requested bits
|
|
* pass the register address to read, a mask to apply to the register and
|
|
* an uint* for the output
|
|
* you can test this value directly as true/false for specific bit mask
|
|
* of use a mask of 0xff to just return the whole register byte
|
|
* returns true to indicate success
|
|
*/
|
|
bool ds3231_getFlag(uint8_t addr, uint8_t mask, uint8_t *flag)
|
|
{
|
|
uint8_t data;
|
|
|
|
/* get register */
|
|
if (!ds3231_recv(addr, &data, 1))
|
|
{
|
|
/* return only requested flag */
|
|
*flag = (data & mask);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Set/clear bits in a byte register, or replace the byte altogether
|
|
* pass the register address to modify, a byte to replace the existing
|
|
* value with or containing the bits to set/clear and one of
|
|
* DS3231_SET/DS3231_CLEAR/DS3231_REPLACE
|
|
* returns true to indicate success
|
|
*/
|
|
bool ds3231_setFlag(uint8_t addr, uint8_t bits, uint8_t mode)
|
|
{
|
|
uint8_t data;
|
|
|
|
/* get status register */
|
|
if (!ds3231_recv(addr, &data, 1))
|
|
{
|
|
/* clear the flag */
|
|
if (mode == DS3231_REPLACE)
|
|
data = bits;
|
|
else if (mode == DS3231_SET)
|
|
data |= bits;
|
|
else
|
|
data &= ~bits;
|
|
|
|
if (!ds3231_send(addr, &data, 1))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ds3231_getOscillatorStopFlag(bool *flag)
|
|
{
|
|
uint8_t f;
|
|
|
|
if (ds3231_getFlag(DS3231_ADDR_STATUS, DS3231_STAT_OSCILLATOR, &f))
|
|
{
|
|
*flag = (f ? true : false);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
inline bool ds3231_clearOscillatorStopFlag()
|
|
{
|
|
return ds3231_setFlag(DS3231_ADDR_STATUS, DS3231_STAT_OSCILLATOR, DS3231_CLEAR);
|
|
}
|
|
|
|
inline bool ds3231_getAlarmFlags(uint8_t *alarms)
|
|
{
|
|
return ds3231_getFlag(DS3231_ADDR_STATUS, DS3231_ALARM_BOTH, alarms);
|
|
}
|
|
|
|
inline bool ds3231_clearAlarmFlags(uint8_t alarms)
|
|
{
|
|
return ds3231_setFlag(DS3231_ADDR_STATUS, alarms, DS3231_CLEAR);
|
|
}
|
|
|
|
inline bool ds3231_enableAlarmInts(uint8_t alarms)
|
|
{
|
|
return ds3231_setFlag(DS3231_ADDR_CONTROL, DS3231_CTRL_ALARM_INTS | alarms, DS3231_SET);
|
|
}
|
|
|
|
inline bool ds3231_disableAlarmInts(uint8_t alarms)
|
|
{
|
|
/* Just disable specific alarm(s) requested
|
|
* does not disable alarm interrupts generally (which would enable the squarewave)
|
|
*/
|
|
return ds3231_setFlag(DS3231_ADDR_CONTROL, alarms, DS3231_CLEAR);
|
|
}
|
|
|
|
inline bool ds3231_enable32khz()
|
|
{
|
|
return ds3231_setFlag(DS3231_ADDR_STATUS, DS3231_STAT_32KHZ, DS3231_SET);
|
|
}
|
|
|
|
inline bool ds3231_disable32khz()
|
|
{
|
|
return ds3231_setFlag(DS3231_ADDR_STATUS, DS3231_STAT_32KHZ, DS3231_CLEAR);
|
|
}
|
|
|
|
inline bool ds3231_enableSquarewave()
|
|
{
|
|
return ds3231_setFlag(DS3231_ADDR_CONTROL, DS3231_CTRL_ALARM_INTS, DS3231_CLEAR);
|
|
}
|
|
|
|
inline bool ds3231_disableSquarewave()
|
|
{
|
|
return ds3231_setFlag(DS3231_ADDR_CONTROL, DS3231_CTRL_ALARM_INTS, DS3231_SET);
|
|
}
|
|
|
|
bool ds3231_setSquarewaveFreq(uint8_t freq)
|
|
{
|
|
uint8_t flag = 0;
|
|
|
|
if (ds3231_getFlag(DS3231_ADDR_CONTROL, 0xff, &flag))
|
|
{
|
|
/* clear current rate */
|
|
flag &= ~DS3231_CTRL_SQWAVE_8192HZ;
|
|
/* set new rate */
|
|
flag |= freq;
|
|
|
|
return ds3231_setFlag(DS3231_ADDR_CONTROL, flag, DS3231_REPLACE);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool ds3231_getRawTemp(int16_t *temp)
|
|
{
|
|
uint8_t data[2];
|
|
|
|
data[0] = DS3231_ADDR_TEMP;
|
|
if (!ds3231_recv(DS3231_ADDR_TEMP,data, 2))
|
|
{
|
|
*temp = (int16_t)(int8_t)data[0] << 2 | data[1] >> 6;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ds3231_getTempInteger(int8_t *temp)
|
|
{
|
|
int16_t tInt;
|
|
|
|
if (ds3231_getRawTemp(&tInt)) {
|
|
*temp = tInt >> 2;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ds3231_getTempFloat(float *temp)
|
|
{
|
|
int16_t tInt;
|
|
|
|
if (ds3231_getRawTemp(&tInt)) {
|
|
*temp = tInt * 0.25;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool ds3231_getTime(struct tm *time)
|
|
{
|
|
uint8_t data[7];
|
|
|
|
/* read time */
|
|
if (ds3231_recv(DS3231_ADDR_TIME, data, 7))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/* convert to unix time structure */
|
|
time->tm_sec = bcdToDec(data[0]);
|
|
time->tm_min = bcdToDec(data[1]);
|
|
if (data[2] & DS3231_12HOUR_FLAG) {
|
|
/* 12H */
|
|
time->tm_hour = bcdToDec(data[2] & DS3231_12HOUR_MASK) - 1;
|
|
/* AM/PM? */
|
|
if (data[2] & DS3231_PM_FLAG) time->tm_hour += 12;
|
|
} else {
|
|
/* 24H */
|
|
time->tm_hour = bcdToDec(data[2]);
|
|
}
|
|
time->tm_wday = bcdToDec(data[3]) - 1;
|
|
time->tm_mday = bcdToDec(data[4]);
|
|
time->tm_mon = bcdToDec(data[5] & DS3231_MONTH_MASK) - 1;
|
|
time->tm_year = bcdToDec(data[6]) + 100;
|
|
time->tm_isdst = 0;
|
|
|
|
// apply a time zone (if you are not using localtime on the rtc or you want to check/apply DST)
|
|
//applyTZ(time);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
void ds3231_Init(uint8_t scl, uint8_t sda)
|
|
{
|
|
i2c_init(scl, sda);
|
|
}
|